Valve return device



Dec., 119, 1950 .L PANHARD VALVE RETURN DEvcL 2 Sheets--Sheet 1 Filed May 2, 1949 Dec., 19, 1950 .1. PANHARD 2,534,621

VALVE RETURN DEVICE Filed May 2, 1949 .2 Sheets-.Sheet 2 Patented Dec. 19, 1950 VALVE RETURN DEVICE .lean Panhard, Paris, France, assigner to Societe Anonyme des Anciens Etablissements Panhard & Levassor, Paris, France Application May 2, 1949, Serial No. 90,861 In France May 5, 1948 l 3 Claims.

My invention is concerned with a return device common to a pair of adjacent valves wherein the return levers for the valve pair are interconnected by a torsion system which is particularly compact and in which no bending stresses are imposed upon the torsionally stressed members of the device.

With this end in View, I provide a system composed of three elements, viz.: a pair of torsion sleeves rigid with the respective return levers at their abutted ends and having their opposite ends resiliently interconnected by means of a torsion bar projecting through the pair of abutted sleeves. In this manner, any rocking action eX- erted upon the one of said return levers is transmitted to the other through the one sleeve, the torsion bar and the other sleeve, with the result that the effective length of the resilient connection is twice its actual length.

A preferred embodiment of the valve return device according to my invention will now be described by way of exemplication and by no means of limitation reference being had to the appended drawings in which:

Figure l is a longitudinal sectional view of the resilient connection device;

Figure 2 is a sectional view taken on line II-II in Fig. l and shows the valves, the return levers and the way in which either lever is splined on the inner end of one of the abutted sleeves in its position corresponding to the seated or closed position of the related valve.

Figure 3 is a sectional view taken on line III-III in Fig. 1 and shows the position of the lever forks with respect to the abutted hubs of the levers.

The valve shanks l, l are urged upwards by the levers Si, 3 acting from below upon the flanges d, il. The hubs of said levers are mounted in roller bearings 5, 5 in guides 9, 9'. Moreover, said hubs are splined on the fluted inner ends of a pair of abutted torsion sleeves l, l having their opposite ends rotatably mounted in the blind outer ends of said guides 9, 9. On the other hand, said torsion sleeves are splined at the same ends on the outer ends of a torsion bar iii, thus completing the resilient connecting system. The hubs are so splined on the respective sleeve ends that in the position shown in Fig. 2 in which both valves are seated the connecting device still stands under a deinite residual stress. As one of the valves is moved clear oi its seat and consequently the valve shank and the flange thereon are depressed, the angular position of the related lever with respect to the other is changed and the resilient system composed oi sleeve l, bar I0 and sleeve 'i' is subjected to an additional torsional stress.

Fig. 3 shows that the forks on the levers are positioned dissymnietrically with respect to the hubs.

The general character of my invention, which extends to any device adapted to load a pair of valves with the aid of coaxial levers rigid with the respective ends of a resilient system composed oi concentric elements is in no way restricted by the details of construction oi the embodiment described.

What I claim as my invention and desire to secure by Letters Patent is:

1. A device adapted to load a pair of valves comprising a pair of valve-return levers, a iluted cylindrical aperature in the hub of each lever, a pair of sleeves iiuted at their outsides at one end thereof, abutted to each other at their iluted ends and splined at said ends each in the iluted hub of one of said levers and resiliently interconnected by a torsion member.

2. A device adapted to load a pair of valves according to claim 1 wherein the sleeves are fluted inside each at its end remote from its externally iiuted one, the sleeve-interconnecting torsion member consists of a resilient bar projecting through the pair of abutted sleeves, fluted at either end thereof and splined at said ends in the internally luted ends of the torsion sleeves.

3. A return device provided in common for a pair of valves in a same engine comprising a torsion bar, a pair of torsion sleeves concentric to and surrounding said bar, the outer ends of said sleeves being iixed to the ends of said bar while their inner ends are directed toward each other, and a pair of return levers each controlling one of said valves and fixed one at each of said inner ends of said sleeves respectively.

JEAN PANHARD.

REFERENCES CTTED The following references are oi record in the le of this patent:

UNTTED STATES PATENTS- Number Name Date 2,100,057 Krebs Nov. 23, 1937 2,333,008 Holmstrom et al. Oct. 26, 1943 2,395,183 Holmstrom et al. Feb. 19, 1946 

